Bicycle MechanicsBroken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

If I understand your problem the braze-on cable housing anchor on the headtube for the rear derailleur cable is interferring with the front brake caliper. Sounds very odd and I don't think Campagnolo brakes will be any better. It does sounds like the anchor was installed in the wrong place.

Try installing a spacer washer on the brake mounting bolt between the front of the fork crown and the rear of the caliper.

I saw a bike this way the other day somewhere on the net. The down tube stops where mounted on the head tube. Hopefully somebody who has this configuration will chime in and give you some help.

This configuration has become extremely common on mid to high level road bikes ever since STI/Ergo pretty much blew away downtube shifters and the need for downtube mounted shifter bosses. It keeps the cable housing from rubbing on the sides of the head tube and allows slightly shorter housing runs.

My new Litespeed has the cable stops mounted this way and there is absolutely no problems with the cable runs or brake interference. I still think the fitting was mounted wrong or we don't have a clear pcture of what is going on.

It sounds to me like you are trying to fit a front brake that has a nutted mounting bolt on a frame that was designed for a recessed brake bolt.

Interesting point. The OP said the "caliper" is interferring with the cable housing stop but maybe it is the rear of a nutted brake bolt. I further expect the fork is intended for a recessed nut so the brake mounting wouldn't be properly secure if it's a nutted version.